>6 



OSCAR TEAGUE 

 TABLE 3 



typhi murium cultures showed good growth on Victoria blue agar. 

 The hog cholera organisms fall into two sharply defined groups; 

 6 of the cultures are almost completely inhibited, like paratyphoid 

 B strains, 9 strains are not inhibited and only one strain shows 

 moderate inhibition. Jordan (1917) says: 



A few strains of porcine origin possess the characteristics of the 

 B. paratyphosus B. type. These, however, are all strains that have 

 been under cultivation for some time. A number of strains, par- 

 ticularly some of the older cultures, have shown marked variations 

 §ince they came into my hands. Some of the difficulty experienced 

 by previous observers in the differentiation of the B. paratyphosus 

 and B. suipestifer types has been probably due to the existence of stock 

 cultures labelled in one way or the other, but possessing the cultural 

 and agglutinative character of the opposite type. The extent to 

 which transformation of one type into the other occurs under the ordi- 

 nary conditions of laboratory cultivation is a matter for further 

 investigation. 



In view of this situation with regard to the B. suipestifer cul- 

 tures, one is tempted to conclude that paratyphoid B, alone of 

 all the paratyphoid enteritidis group of organisms is inhibited 

 in its growth by the strength of Victoria blue 4 R. employed in 

 the above experiments. It would seem highly desirable to repeat 

 the experiments with freshly isolated strains. 



REFERENCE 

 Jordan, E. O. 1917 Jour. Inf. Dis., 20, 477. 



